Electric motor.



W. K. HOWE.

ELECTRIC MOTOR.

APPLICATION IILED AUG. 9, 1911.

1 1,094,389. Patented Apr.21,1914.

2 BHEETSr-SHEET 1.

FIG.I

// WITNESSES: I v M W. K. HOWE.

v ELEGTRIG MOTOR. APPLICATION FILED AUG. 8, 1911.

1,094,389, I Patented Apr. 21, 1914.

FIG.- 11 I ITNESSES: INVEN TOR ,f i am UNITED STATES PATENT OFFICE.

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ELECTRIC MOTOR.

Specification of Letters l'atent.

Patented Apr. 21, 1914.

To all whom it may concern Be it known that I, Wm'rrraor K. Hows, acitizen of the United States, and resident of the city ofBodiester, inthe county of Monroe and State of New York, have invented a new anduseful Electric Motor, of which the follo is a specification.

This invention re ates to an electric motor and more particularly to theconstruction of the parts surrounding the rotating element commonlycalled the rotor or armature.

The object of the invention is to so construct and arrange thestructural elements of an electric motor, that no loose material mayinterfere with the proper rotation of the rotor or armature, whethersuch loose material comes from sources outside of the companying sheetsof motor itself or from the destruction or b away of parts of the motorother thantherotororarmature.

In electric motors it is highly desirable to prevent the posibility ofany foreign material 1 between the rotor and the stator. is especiallyso in the case of motors employing the shell type rotor, and more especiso in the case of the very small motors used as an operative means forcircuit breake such as signaling relays. On account of ihe lightconstruction of the rotor and the extremely small turning torqueproduced in it, a foreign substance between the shell and the stator teither cause a or tearing of the ell or result in a total stoppage ofthe motor when current was a plied to cause it to rotate.

Another diflic still more actions would be to hold the ll in its moved'tion after the flow of current had cea Such an act would cause thecontacts of the relay to remain closed when they should be open,consequently the signal controlled thereby would remain in the clearsition when it should to the dan r tion.

In de rib' the five ft i on in detail referencewillbeadtothefiguresofthe acdraw o; and t0 the characters of reference u.thereon, of which like characters designate like parts,

andinwhich:

Figure 1 is a sectional elevation of a'motor of the shell type with minvention ap lied thereto; .2isasi elevationo the stator mom with of myinvention indicated thereon in otted lines.

Nnmeralldesignatqanironshellorcasing, open at both ends; 2, as clearlyshown in Fig. 2, designates an annulus an as shown' in Fig. 1, islaminated in the well known manner of the fields of electric motors,there being slots 3 extending transversely oLthe annulus and opening onthe inner bounding face of the annulus. The case 1. being entirely o .nat one end'allows the annulus to be slid into its proper place into thecase, as shown in Fig. 1. The open end of the case is then closed by acap as 4, which may befastened to the case in any approved manner. Theannulus or stator has upon it the well known coils 5, the leads of whichas shown in Fig. 2, are designated by 6, 7, 8, 9 and 10,. which leadsare connected to the source of propulsion current in the well known andapproved manner. These coils, during the course of construction, are tad as designated by 11,'in' Fig. 2, and a r being entirely formed,are-thoroughly impregnated with some insulating compound a in a mannerwell known and understood. In each of the slots 3, a wooden strip 12 isplaced, which not only prevents the coils from becoming dislodged, butalso revents any loose material in the part of t e coils in the slotsfrom falling into the inner space bounded by the annulus, and on eachside of the annulus is placed. an annulus of some non-magnetic material,preferably brass, as designated by 13 and 14, Fig. 1. This annulus ofbrass bears on one side against the annulus 2 and on the other side inthe case of 13, against the case 1 proper;-and in the case of 14, bearsagainst a. shoulder on the cap 4 and thus prevents any loose materialwhich may be in the coil chambers from getting out.

The rotor consists of a shell 15 shown in Fig. 1, which is attached to aspider 16, which has a shaft 17 pas therethrough,

-which is journaled in a ro ler bearing 18 inserted in the cap 4 andalso has an a te bea 19 supporting its other end, wich a bearing isborne by a cap 20 which just fits the open space in one side of the andwhic may be fastened to the case a er bein put in place in any a u nner.The cap 20 has an inwa y projecting member 21, which bears upon itsouter face the annulus 22, which is laminated in the same manner as thestator and isheld in place upon the inwardly rojecting member 21 bymeans of the colar 23,

roved which is screw threaded upon the inwardly rojecting member 21. heannulus '22, orms a means for decreasing the reluctancel of the magneticpath between diametrically op osite poles of the stator.

t must be readily seen that the form of construct-ion herein shownanddescribed absolutely prevents an loose material which may be thrownofi roin the coils5 of the stator in the chambers 24, 25, 26 and 27 fromfalling into the chamber 28 in which the shell rotor 15 is placed, andthat-the cap 4 and, the cap 20 absolutely prevent any of the foreignmaterial from outside sources from entering the chamber28', so that atthe time the device is assembled, the chamber28 can be thoroughlycleaned out by blowing or other means and that after the cap 20 is putin place, complete assurance is had that nothing ma thereafter enterthechamber 28 to inter ere with the rotation of the rotor 15.

As the rotor 15 is of the shell type and of extremely lightconstruction, and consequently would not require an excessive amount offorce to bend or tear it, it is es sential for successful operation thatit be well guarded, as the gap in which it revolves between stator 2 andmember 22 must be made as small as possible in order to attain maximumefliciency.

Although applicant has herein shown and described his invention by aarticular physical embodiment in which a s ell rotor 18 used, it is tobe understood that applicants invention is not limited to motorsemploying a shell rotor, for it is equally applicable and as valuable inmotors employing any type of rotor, such for instance as the ordinaryand well known wire wound rotor.

Having thus described the principle of myinvention and described aarticular specific embodiment thereof, what I claim as new and desire tosecure by Letters Patent, is:

1. In an electric motor, a shell rotor, a stator, means for forming adust proof chamber for the rotor, comprising the inner face of thestator, having slots therein closed by strlps of non-magnetic material,nonmagnetlc -members bearing on either side of the stator and a theother sides of the non-magnetic members, said casing having a removable.portion allowing access to said chamber, anda body of magnetic materialwithin said rotor supportedby said removable portion of said casing.

2. In an electric motor, a shell rotor, a stator, means for forming dustproof chamher for the rotor, comprising the inner face of the stator,having slots therein closed by strips of non-magnetic material, non-manetic members bearing on either side of t e stator and a casing bearingagainst the other sides of the non-magnetlc members, said casing havin aremovable portion allowing access to sai chamber.

3. In an electric motor, a casing, .a stator therein, a shell rotoradapted to revolve within said stator, and aa body of magnetic materialwithin said rotor, supported by a removable portion of said casing,forming part of the outside wall thereof, and a bearing for said rotorin said removable portion of said casin 4. In an eictric motor, a casingformed with a removable 'portion, a stator therein, a shell rotor adated to revolve within said stator, a body 0 magnetic material withinsaid rotor supported by the removable portion of said casing. WINTHROPK. HOWE.

Witnesses:

LILLIAN L. PmLLrrs, MARY G. DALBEY.

casing bearing against

